A Biddeford landlord accused of shooting and killing two tenants in December 2012 changed his plea to guilty on Wednesday.

Pak, 78, pleaded guilty to two counts of murder and one count of attempted murder.

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“Are you pleading guilty because you are in fact guilty?” Justice John O'Neil ask Pak. “Yea, I am guilty,” Pak replied.

Pak killed Alivia Welch, 18, and Derrick Thompson, 19, in a dispute over parking and unpaid rent. Thompson's mother, Susan Johnson, was also shot but survived by playing dead.

During the hearing, prosecutors told the court all of the evidence they had against Pak and the witnesses they would have called to testify in a trial.

Assistant Attorney General Leane Zainea told the court Johnson recorded an argument between Pak and her son on Dec. 29, 2012. Thompson then called 911.

A Biddeford police officer initially responded to the dispute, and did not press any charges.

Less than five minutes later, Biddeford police were called back to the home for a report of shots fired, Zainea said.

"It's something I think about every day,” Johnson said, “It's something I don't think I'll ever get past or forget.”

Attorney Joel Vincent said Pak decided to plead guilty to spare himself, his wife and the victims' families from the ordeal of a trial.

“He wished to accept responsibility,” Vincent said. “He also wished to spare his wife and himself and his family and the victim’s family and friends what would have been a heart wrenching and needless trial."

Pak originally pleaded not guilty by reason of insanity. His trial had been scheduled to begin Feb. 17.There is no agreement with prosecutors regarding a sentence, Vincent said.

“It's been a long three years waiting,” Johnson said. “It shouldn't have gone this long. If he wanted to spare everybody's feelings and not having to go through the trial he could have done this three years ago.”

A judge will sentence Pak on Feb. 11. O’Neil said the state minimum in this case is 25 years in prison.

Johnson said she was waiting for the criminal case to end before filing civil cases against Pak and his wife. She also plans to file a civil case against the Biddeford Police Department.